Field descriptions:
Perf: When this bit is set to 0, this indicates that informational exception operations that can cause
delays are acceptable. This bit should be set to zero.
Dexcpt:
When this bit is set to zero the reporting method indicated by the MRIE field is used. When this bit
is set to one this indicates that the media changer shall disable all information exception
operations, ignoring the MRIE field (In this mode the initiator must the poll the Tape Alert log
page). Currently only MRIE mode 0 is supported, so this bit is ignored.
Test: Test modes are not supported, this field must be set to zero.
LogErr:
When this bit is set to 0, the media changer shall not log any Tape Alert events. When this bit is
set to 1, the media changer shall log Tape Alert events.
MRIE: With this field the initiator can specify the method used by the media changer to report
informational exception conditions (Tape Alert events). Currently only mode 0 is supported. This
means that Tape Alert flags can only be read by polling with the LOG SENSE command to the
Tape Alert page.
Interval Timer:
The media changer does not report Tape Alert conditions as Informational Exception conditions,
therefore this field must be set to zero.
Report Count / Test Flag Number:
Since test modes are not supported, this field reports Report Count only. But the media changer
does not report Tape Alert events as Informational Exception conditions, therefore this field must
be set to zero.
Element Address Assignment page (1Dh)
The Element Address Assignment Page is used to assign new addresses to the elements of the medium
changer (via the Mode Select command) and to report those assignments (Mode Sense). When requested
the media changer can store new element addresses in NVRAM. When stored in NVRAM these
addresses will automatically become the default addresses after every power up. The format of the
element address assignment page is shown in the next table. Note this page will only be stored in non
volatile memory when the Host sets the SP bit in the CDB.
Bit 7 6 5 4 3 2 1 0
Byte
0 Reserved SPF (0) Page Code (1Dh)
1 Additional Page Length (12h)
2 First Medium Transport Element Address
3 Number of Medium Transport Elements
4 First Storage Element Address
5 Number of Storage Elements
6 First Import / Export Element Address
7 Number of Import / Export Elements
8 First Data Transfer Element Address
9 Number of Data Transfer Elements
10 Reserved
11 Reserved
3-24 TL2000 and TL4000 SCSI Reference
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